All of the Following Are True of Red Tides EXCEPT

Multiple Choice

All of the following are true of red tides EXCEPT:

A) they are caused by certain species of harmful algae that grow in large concentrations
B) they frequently cause the water to appear orange red or brown
C) they produce toxins that attack the nervous system of some sea life
D) observed in association with phases of the moon
E) no one knows what triggers them